Cochlear Implants

• cochlear implants convert sound into an electric signal and stimulate the cochlear nerve directly

• Components: microphone (placed above ear), processor (placed behind the ear or worn in the pocket), receiver-stimulator, and implantable electrode (typically placed intracochlearly in the scala tympani via the round window)

• Contraindications: infected ear, retrocochlear disease, Michel's deformity (Mondini deformity and other deformed cochlea are not contraindicated), inability to participate in an extensive rehabilitation program (noncompliance)

• Complications: device failure (eg, electrode malfunction), infection (eg, wound infection, meningitis), skin flap breakdown, device migration or extrusion, facial paresis or paralysis, perilymphatic gusher (increased risk with Mondini's deformity)

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